Sofa



FIG. 1 is a front perspective view of a furniture system embodying the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a rear view of FIG. 1;

FIG. 5 is a right side view of FIG. 1; and,

FIG. 6 is a left side view of FIG. 1.

The dashed lines in FIGS. 1–6 show environment and form no part of the claimed design. 

We claim the ornamental design for a sofa, as shown and described. 